A retraction device for movable furniture parts has a driver movable along a first guide path, which is movable between a retracted position and a parked position and is directly or indirectly pretensioned into the retracted position by an energy storage device. The driver can be coupled to an activator in order to move the movable furniture part into a closed position. A method uses the driver for opening and closing the movable furniture part and tensioning and releasing a retraction device.

A retraction device for movable furniture parts has a driver movable along a first guide path, which is movable between a retracted position and a parked position and is directly or indirectly pretensioned into the retracted position by an energy storage device. The driver can be coupled to an activator in order to move the movable furniture part into a closed position. A method uses the driver for opening and closing the movable furniture part and tensioning and releasing a retraction device.

The linear-to-rotary actuator is a device that has two rotors at opposite ends of a main housing tube, the rotors being driven to rotate by a slider disposed between the rotors, the slider being attached to the piston of a linear actuator. The device may be configured so that angular displacement between the rotors may be adjusted for use with apparatus that may require variable angular displacement between articulated segments, such as a robotic arm, the arm of an excavator or crane, and the like. In one embodiment, the device has rollers mounted on opposite sides of the slider that engage tracks defined in adaptors selectively coupled to the rotors by boltless connectors. In another embodiment, the device has gear trains driven by the slider that are coupled to the rotors for multiplying angular displacement between the rotors.

A pendulum device includes a base. A rotating plate is pivoted on the base. A movable member is eccentrically pivoted on the rotating plate by one of two ends thereof, and the other end of the movable member is for connecting to an article to be operated. A driving unit is at one side of the base. The driving unit is for driving the rotating plate of the base to perform a uniform circular motion. Because of the movable member eccentrically pivoted on the rotating plate, when the operating end is connected to the article, the operating end is dragged by the transmission of the rotating plate to perform a simple harmonic motion that is a variable accelerating linear motion relative to the rotating plate.

An armlike driving mechanism includes a power source connected to a screw rod and a nut, a driving assembly including a first gear, a second gear, and a drive belt, a rail assembly including a linear rail and a sliding element, and a connecting block fixed on the drive belt and linked to the nut and the sliding element. The power source drives the screw rod and the nut by back and forth rotation, thereby displacing the sliding element in an X axle direction and driving the first gear in an Y axle direction by the connecting block and the drive belt, so as to operate the armlike driving mechanism.

A pendulum device includes a base. A rotating plate is pivoted on the base. A movable member is eccentrically pivoted on the rotating plate by one of two ends thereof, and the other end of the movable member is for connecting to an article to be operated. A driving unit is at one side of the base. The driving unit is for driving the rotating plate of the base to perform a uniform circular motion. Because of the movable member eccentrically pivoted on the rotating plate, when the operating end is connected to the article, the operating end is dragged by the transmission of the rotating plate to perform a simple harmonic motion that is a variable accelerating linear motion relative to the rotating plate.

A fitness equipment spring counterweights balancer, comprising hand wheel, lead screw, upper and lower frame beams, upper and lower pulley blocks, spring guiding pillar, upper and lower spring seats, at least one spring, vortex track, big wheel, steel wire rope connecting the pulley block and the vortex track, steel wire rope which connects both the big wheel and fitness equipment. The springs are arranged between upper and lower spring seats. After the spring guiding pillar passes through the springs and the upper and lower spring seats, the both ends of the spring guiding pillar are connected with the upper and lower frame beams. One end of the steel wire rope connecting the pulley block and the vortex track is mounted on one side of the lower pulley block. One end of the steel wire rope connecting the big wheel and fitness equipment is mounted on the big wheel.